21220518130263 has 12 divisors (see below), whose sum is σ = 32265115286040. Its totient is φ = 13402432503216.

The previous prime is 21220518130237. The next prime is 21220518130291. The reversal of 21220518130263 is 36203181502212.

21220518130263 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 0 + 518 + 130 + 2 + 6 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21220518130263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220518830263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62048298456 + ... + 62048298797.

It is an arithmetic number, because the mean of its divisors is an integer number (2688759607170).

Almost surely, 2^{21220518130263} is an apocalyptic number.

21220518130263 is a deficient number, since it is larger than the sum of its proper divisors (11044597155777).

21220518130263 is a wasteful number, since it uses less digits than its factorization.

21220518130263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124096597278 (or 124096597275 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 21220518130263 its reverse (36203181502212), we get a palindrome (57423699632475).

The spelling of 21220518130263 in words is "twenty-one trillion, two hundred twenty billion, five hundred eighteen million, one hundred thirty thousand, two hundred sixty-three".